View topic - World's rivers in crisis

It is currently December 12th, 2019, 8:33 am

All times are UTC - 5 hours





Post new topic Reply to topic  [ 1 post ] 
Author Message
 Post subject: World's rivers in crisis
PostPosted: September 29th, 2010, 8:59 pm 
Offline
User avatar

Joined: December 29th, 2002, 7:00 pm
Posts: 6146
Location: Bancroft, Ontario Canada
This map published in Nature shows areas where river and watershed degradation has resulted in threats to biodiversity and human water supply.

Image

http://www.nature.com/news/2010/100929/ ... box/1.html

http://www.nature.com/news/2010/100929/ ... 0.505.html


Quote:
'River crisis' worsens threat of water scarcity - study
(AFP) – 12 hours ago

PARIS — The vast majority of the world's rivers are reeling from pollution, over-development and excessive extraction, and billions of dollars of investment by rich countries to avert water stress have damaged biodiversity, a study released on Wednesday said.

"Rivers around the world really are in a crisis state," said one of its authors, Peter McIntyre, a professor of Zoology at the University of Wisconsin at Madison.

The investigation, published by the journal Nature, looked at the health of the world's major rivers, assessing them for water security and the state of their wildlife.

Their probe covered 23 factors, including water extraction, types of agriculture and industry, pollution levels, habitat, wildlife, population growth and urban development.

The result makes for grim viewing.

"We find that nearly 80 percent of the world's population is exposed to high levels of threat to water security," the authors say.

Over 30 of the world's 47 largest rivers, which collectively account for half of the global runoff of freshwater, are under at least "moderate" threat, they say.

Eight of them are rated as being under very high threat in terms of water security for humans. Fourteen of them are rated as being under very high threat for biodiversity.

In contrast, the rivers of Scandinavia, Siberia, northern Canada and unsettled parts of the tropical zone in Amazonia and northern Australia have the lowest threat rating.

In rich countries, heavy investment in dams and reservoirs and diverting flows from wetlands has benefited 850 million people, reducing their exposure to extreme water scarcity by 95 percent.

But this has failed to address the cause of water stress itself and had the worst impact on wildlife, in some cases dramatically reducing habitat for aquatic species, says the paper.

"(This) underscores the necessity of limiting threats at their source instead of through costly remediation of symptoms," it says tartly.

In upper-middle income countries, investment has benefited 140 million people, reducing their risk of extreme water scarcity by 23 percent.

In developing countries, "minimal investment" in infrastructure has meant 3.4 billion people find themselves in the highest category of threat.

"Most of Africa, large areas in central Asia, and countries including China, India, Peru or Bolivia struggle with establishing basic water services like clean drinking water and sanitation," says the study.

"(They) emerge here as regions of greatest adjusted human water security threat."

Fuelling the gloom, the study says its estimates are most probably conservative. It was unable to take into account in pollution from mining or the effects on biodiversity from rising levels of pharmaceutical products in river water.

Looking into the future, it also points out that climate change is among the basket of "escalating trends" that will add to pressure on rivers and the species they nurture.

"Without major policy and financial commitments, stark contrasts in human water security will continue to separate rich from poor," it warns.



http://www.google.com/hostednews/afp/ar ... 55cda1.291

_________________
><((((º>


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 1 post ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group